EP 0993881 A2 20000419 - Constrained hardening method and apparatus for deformed bar workpieces
Title (en)
Constrained hardening method and apparatus for deformed bar workpieces
Title (de)
Zwangsabschreck - und Wärmebehandlungsverfahren und -vorrichtung für verzogene stabförmige Werkstücke
Title (fr)
Procédé et appareil de durcissement à contrainte et de traitement thermique pour des pièces en forme de barre déformées
Publication
Application
Priority
JP 30320298 A 19981012
Abstract (en)
Hardening by heating a longitudinal section of a workpiece of a deformed-shape bar and quenching while constraining the workpiece section in dies, wherein the quenching is executed while the workpiece being pressed toward a direction perpendicular to its longitudinal direction by a pressing means which is installed adjacent to the workpiece section constrained in the dies. Warping by quenching can be minimized in deformed-shape workpieces as an automobile steering rack bar, wherein warping is difficult to prevent completely in prior constrained quenching process. <IMAGE>
IPC 1-7
IPC 8 full level
C21D 1/10 (2006.01); C21D 1/18 (2006.01); C21D 1/55 (2006.01); C21D 1/673 (2006.01); C21D 9/00 (2006.01); C21D 9/38 (2006.01)
CPC (source: EP US)
C21D 1/673 (2013.01 - EP US); C21D 9/0068 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0993881 A2 20000419; EP 0993881 A3 20001004; EP 0993881 B1 20040128; DE 69914433 D1 20040304; DE 69914433 T2 20040715; JP 2000119739 A 20000425; JP 3007338 B1 20000207; US 6328829 B1 20011211
DOCDB simple family (application)
EP 99120283 A 19991011; DE 69914433 T 19991011; JP 30320298 A 19981012; US 41120499 A 19991004